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preindustrial
| background concentration
| preindustrial | |
| gen. | 工业化以前的; 未工业化的 |
| background concentration | |
| ecol. | 本底污染浓度 |
| oil | 背景浓度 |
| |||
| 工业化以前的; 未工业化的 | |||
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preindustrial background concentration : 5 phrases in 3 subjects |
| Advertising | 1 |
| Technology | 3 |
| Water resources | 1 |
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